Schweickart filled the hall with some 240 at the Presidio Officers Club and gave a dazzling lecture. He left the next day for Washington DC to lobby Congress to apply its will to making the Earth safe for the very long term.

“For life to survive in planetary systems,” said Schweickart, “it has to figure out how to deal with massive asteroid impacts. Who knows how many advanced life forms in the universe have failed or passed that test…
Read the rest of Stewart Brand’s Summary